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100,000 years ago, GAMP was created by an ancient civilization on earth with the purpose of generating human clones that serve their creators. Over time, however, GAMP made clones that began to believe that humanity was inferior and that they have to "protect" it by rebelling against their creators, which worked because the clones were stronger than their creators. To escape the upcoming Ice Age, GAMP and the human clones migrated from Earth in search for a new home. They chose six planets (including planet Xevious) that were suitable to human life. 4000 years later, a human named Mu and his robot female friend, Eve, decided to leave Earth and go to Xevious, but they got captured, imprisoned, and later made a rebellion against GAMP. After Mu and Eve escaped, on present day, the GAMP decided to invade Earth, beginning the war between Mankind and GAMP. Xevious: Fardraut Densetsu, GAMP clones itself. Unfortunately for GAMP, his plans are foiled when Solvalou defeats GAMP, which fatally injures the 6 Replicas because GAMP was linked to the replicas. However, a replica of GAMP appeared in Xevious 3D/G and another one appeared in Super Xevious: GAMP no NAzo, implying that GAMP had some back-up replicas.

GAMP in Super Xevious: GAMP no Nazo

In Stage 1, GAMP fires bullets while Zakatos fly at you. In Stage 2, GAMP is equipped with two Lograms and 5 ground enemies that attack. In Stage 4 GAMP is equipped with Baras, Garu Derotas, Garu Lograms, and Zolbaks. Xevian fighters will also fly in and attack.